https://wiki.ubuntu.com/Audio/PositionReporting suggests to edit
/etc/modprobe.d/alsa-base.conf

For me this fixed the issue:
Add 
options snd-hda-intel position_fix=2
to /etc/modprobe.d/alsa-base.conf and reboot.

Maybe this also helps in your case.

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https://bugs.launchpad.net/bugs/1035852

Title:
  [Lenovo ThinkPad X201, Conexant CX20585, Speaker, Internal] No sound
  at all

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